66386624654 has 16 divisors (see below), whose sum is σ = 113834168448. Its totient is φ = 28444279032.

The previous prime is 66386624653. The next prime is 66386624687. The reversal of 66386624654 is 45642668366.

It is a self number, because there is not a number n which added to its sum of digits gives 66386624654.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66386624653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 536252 + ... + 648335.

It is an arithmetic number, because the mean of its divisors is an integer number (7114635528).

Almost surely, 2^66386624654 is an apocalyptic number.

66386624654 is a deficient number, since it is larger than the sum of its proper divisors (47447543794).

66386624654 is a wasteful number, since it uses less digits than its factorization.

66386624654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188599.

The product of its digits is 29859840, while the sum is 56.

The spelling of 66386624654 in words is "sixty-six billion, three hundred eighty-six million, six hundred twenty-four thousand, six hundred fifty-four".